Design and Simulation of Quadrature Phase Detection in Electrical Capacitance Volume Tomography
Abstract: Capacitance
measurement accuracy is affected by phase conformity between signal and reference.
This work describes phase detection scheme which is necessary for phase
synchronization intomography application. Core processing for calculating phase
and amplitude of the detected signal wasbuilt on FPGA (Field-Programmable
Gate-Array) platform. Phase shift demodulation algorithm employs IP core
provided by Xilinx FPGA. Direct digital synthesizer (DDS), multiplier,
accumulator, and CORDIC (coordinate rotation digital computer) modules were
used as excitation-reference signal generator, signal multiplication,
accumulation, and conversion to polar coordinate in order to conduct
trigonometric operation respectively. Hardware design was emulated on
MATLAB-Xilinx System Generator to observe its performance. Phase detection
range 0-114.58o and mean absolute error 0.58o have been achieved. Data processing
rate solely at digital signal stage was approximately 100data/s suitable for
32-channel electrical capacitance volume tomography (ECVT) system.
Author: Imamul Muttakin, Arbai
Yusuf, Rohmadi, Wahyu Widada, Warsito P. Taruno
Journal Code: jptkomputergg150067
